| abstract |
A catalyst for isocyanate polymerization, a process for producing the same, and a process for producing a polyisocyanate containing an isocyanurate group using the same are provided. The catalyst is a carboxylic acid salt containing di-quaternary ammonium ion. The structure of the catalyst includes a hydroxyl group-containing aromatic heterocyclic residue. The catalyst has high activity. Only a small amount of catalyst is required for the polymerization of isocyanate. The prepared polyisocyanate has a color value of less than 25 Hazen, a monomer content of less than 0.5 wt%, a high isocyanurate content and a low viscosity. |